2 * Freescale iMX PATA driver
4 * Copyright (C) 2011 Arnaud Patard <arnaud.patard@rtp-net.org>
6 * Based on pata_platform - Copyright (C) 2006 - 2007 Paul Mundt
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
14 * - check if timing stuff needed
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/blkdev.h>
19 #include <scsi/scsi_host.h>
20 #include <linux/ata.h>
21 #include <linux/libata.h>
22 #include <linux/platform_device.h>
23 #include <linux/clk.h>
25 #define DRV_NAME "pata_imx"
27 #define PATA_IMX_ATA_CONTROL 0x24
28 #define PATA_IMX_ATA_CTRL_FIFO_RST_B (1<<7)
29 #define PATA_IMX_ATA_CTRL_ATA_RST_B (1<<6)
30 #define PATA_IMX_ATA_CTRL_IORDY_EN (1<<0)
31 #define PATA_IMX_ATA_INT_EN 0x2C
32 #define PATA_IMX_ATA_INTR_ATA_INTRQ2 (1<<3)
33 #define PATA_IMX_DRIVE_DATA 0xA0
34 #define PATA_IMX_DRIVE_CONTROL 0xD8
36 struct pata_imx_priv {
38 /* timings/interrupt/control regs */
39 void __iomem *host_regs;
43 static int pata_imx_set_mode(struct ata_link *link, struct ata_device **unused)
45 struct ata_device *dev;
46 struct ata_port *ap = link->ap;
47 struct pata_imx_priv *priv = ap->host->private_data;
50 ata_for_each_dev(dev, link, ENABLED) {
51 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
52 dev->xfer_shift = ATA_SHIFT_PIO;
53 dev->flags |= ATA_DFLAG_PIO;
55 val = __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
56 if (ata_pio_need_iordy(dev))
57 val |= PATA_IMX_ATA_CTRL_IORDY_EN;
59 val &= ~PATA_IMX_ATA_CTRL_IORDY_EN;
60 __raw_writel(val, priv->host_regs + PATA_IMX_ATA_CONTROL);
62 ata_dev_info(dev, "configured for PIO\n");
67 static struct scsi_host_template pata_imx_sht = {
68 ATA_PIO_SHT(DRV_NAME),
71 static struct ata_port_operations pata_imx_port_ops = {
72 .inherits = &ata_sff_port_ops,
73 .sff_data_xfer = ata_sff_data_xfer_noirq,
74 .cable_detect = ata_cable_unknown,
75 .set_mode = pata_imx_set_mode,
78 static void pata_imx_setup_port(struct ata_ioports *ioaddr)
80 /* Fixup the port shift for platforms that need it */
81 ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << 2);
82 ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << 2);
83 ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << 2);
84 ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << 2);
85 ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << 2);
86 ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << 2);
87 ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << 2);
88 ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << 2);
89 ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << 2);
90 ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << 2);
93 static int pata_imx_probe(struct platform_device *pdev)
95 struct ata_host *host;
97 struct pata_imx_priv *priv;
99 struct resource *io_res;
102 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
106 irq = platform_get_irq(pdev, 0);
110 priv = devm_kzalloc(&pdev->dev,
111 sizeof(struct pata_imx_priv), GFP_KERNEL);
115 priv->clk = devm_clk_get(&pdev->dev, NULL);
116 if (IS_ERR(priv->clk)) {
117 dev_err(&pdev->dev, "Failed to get clock\n");
118 return PTR_ERR(priv->clk);
121 ret = clk_prepare_enable(priv->clk);
125 host = ata_host_alloc(&pdev->dev, 1);
131 host->private_data = priv;
134 ap->ops = &pata_imx_port_ops;
135 ap->pio_mask = ATA_PIO0;
136 ap->flags |= ATA_FLAG_SLAVE_POSS;
138 priv->host_regs = devm_ioremap(&pdev->dev, io_res->start,
139 resource_size(io_res));
140 if (!priv->host_regs) {
141 dev_err(&pdev->dev, "failed to map IO/CTL base\n");
146 ap->ioaddr.cmd_addr = priv->host_regs + PATA_IMX_DRIVE_DATA;
147 ap->ioaddr.ctl_addr = priv->host_regs + PATA_IMX_DRIVE_CONTROL;
149 ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
151 pata_imx_setup_port(&ap->ioaddr);
153 ata_port_desc(ap, "cmd 0x%llx ctl 0x%llx",
154 (unsigned long long)io_res->start + PATA_IMX_DRIVE_DATA,
155 (unsigned long long)io_res->start + PATA_IMX_DRIVE_CONTROL);
157 /* deassert resets */
158 __raw_writel(PATA_IMX_ATA_CTRL_FIFO_RST_B |
159 PATA_IMX_ATA_CTRL_ATA_RST_B,
160 priv->host_regs + PATA_IMX_ATA_CONTROL);
161 /* enable interrupts */
162 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
163 priv->host_regs + PATA_IMX_ATA_INT_EN);
166 ret = ata_host_activate(host, irq, ata_sff_interrupt, 0,
174 clk_disable_unprepare(priv->clk);
179 static int pata_imx_remove(struct platform_device *pdev)
181 struct ata_host *host = platform_get_drvdata(pdev);
182 struct pata_imx_priv *priv = host->private_data;
184 ata_host_detach(host);
186 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
188 clk_disable_unprepare(priv->clk);
193 #ifdef CONFIG_PM_SLEEP
194 static int pata_imx_suspend(struct device *dev)
196 struct ata_host *host = dev_get_drvdata(dev);
197 struct pata_imx_priv *priv = host->private_data;
200 ret = ata_host_suspend(host, PMSG_SUSPEND);
202 __raw_writel(0, priv->host_regs + PATA_IMX_ATA_INT_EN);
204 __raw_readl(priv->host_regs + PATA_IMX_ATA_CONTROL);
205 clk_disable_unprepare(priv->clk);
211 static int pata_imx_resume(struct device *dev)
213 struct ata_host *host = dev_get_drvdata(dev);
214 struct pata_imx_priv *priv = host->private_data;
216 int ret = clk_prepare_enable(priv->clk);
220 __raw_writel(priv->ata_ctl, priv->host_regs + PATA_IMX_ATA_CONTROL);
222 __raw_writel(PATA_IMX_ATA_INTR_ATA_INTRQ2,
223 priv->host_regs + PATA_IMX_ATA_INT_EN);
225 ata_host_resume(host);
230 static const struct dev_pm_ops pata_imx_pm_ops = {
231 .suspend = pata_imx_suspend,
232 .resume = pata_imx_resume,
236 static const struct of_device_id imx_pata_dt_ids[] = {
238 .compatible = "fsl,imx27-pata",
243 MODULE_DEVICE_TABLE(of, imx_pata_dt_ids);
245 static struct platform_driver pata_imx_driver = {
246 .probe = pata_imx_probe,
247 .remove = pata_imx_remove,
250 .of_match_table = imx_pata_dt_ids,
251 .owner = THIS_MODULE,
252 #ifdef CONFIG_PM_SLEEP
253 .pm = &pata_imx_pm_ops,
258 module_platform_driver(pata_imx_driver);
260 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
261 MODULE_DESCRIPTION("low-level driver for iMX PATA");
262 MODULE_LICENSE("GPL");
263 MODULE_ALIAS("platform:" DRV_NAME);